Error: Query root type must be provided.

[Tim Badolato]

I am getting this error when the Apollo Server tries to start up.

I copy and pasted the mixin setup from the example and also copy and pasted the welcome action. It's all pretty much boilerplate. I'm just using a GET request to hit the /graphql endpoint.

Please advise. Thanks!

Error: Query root type must be provided.
    at assertValidSchema (/app/node_modules/graphql/type/validate.js:71:11)
    at assertValidExecutionArguments (/app/node_modules/graphql/execution/execute.js:163:35)
    at executeImpl (/app/node_modules/graphql/execution/execute.js:84:3)
    at Object.execute (/app/node_modules/graphql/execution/execute.js:62:63)
    at Object.generateSchemaHash (/app/node_modules/apollo-server-core/dist/utils/schemaHash.js:14:32)
    at ApolloServer.generateSchemaDerivedData (/app/node_modules/apollo-server-core/dist/ApolloServer.js:281:41)
    at new ApolloServerBase (/app/node_modules/apollo-server-core/dist/ApolloServer.js:203:38)
    at new ApolloServer (/app/lib/moleculer-apollo-server/src/ApolloServer.js:21:1)
    at Service.prepareGraphQLSchema (/app/lib/moleculer-apollo-server/src/service.js:407:26)
    at Service./ (/app/lib/moleculer-apollo-server/src/service.js:516:13)
    at Promise (/app/node_modules/moleculer-web/src/index.js:510:20)
    at Promise._execute (/app/node_modules/moleculer/node_modules/bluebird/js/release/debuggability.js:313:9)
    at Promise._resolveFromExecutor (/app/node_modules/moleculer/node_modules/bluebird/js/release/promise.js:483:18)
    at new Promise (/app/node_modules/moleculer/node_modules/bluebird/js/release/promise.js:79:10)
    at Service.aliasHandler (/app/node_modules/moleculer-web/src/index.js:509:11)
    at Promise (/app/node_modules/moleculer-web/src/index.js:383:33)
    at <anonymous>

[Shawn McKnight]

GraphQL has a requirement that there must be a Query type provided (I do not know why). The welcome example is a mutation so having it alone does not satisfy the requirement. You will need to have at least one action that is a query to satisfy the need.

Hope that helps!

[Tim Badolato]

Awesome! Thanks @shawnmcknight !!!